The military and many government agents need s phone that is secure from tracking.
Think of all the data China has from US soldiers using Androids or IPhones.
They have a perfect map of every military facility, who meets with who, etc.
Obviously if military is required to use a secure phone, the manufacturer will instantly become one of the largest in the world.
It will never find success in governments and large corporations. Agents/employees/leaders will just use an exception process to continue using what they find convenient.
Can always mandate it…you know like the vax.